Ballpoint pen



FIG. 1 is a right side elevational view of a ballpoint pen showing mynew design, the left side being a mirror image thereof;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

The ornamental design for a ballpoint pen, as shown and described.